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Mon, 30 Jun 2025 10:01:15 -0400 From: Marcelo Schmitt To: , , , CC: , , , , , , , , , , , , , Subject: [PATCH v7 10/12] iio: adc: ad4170-4: Add support for internal temperature sensor Date: Mon, 30 Jun 2025 11:01:11 -0300 Message-ID: <51abd3617dff088981f487b5bdd9e78b26f74929.1751289747.git.marcelo.schmitt@analog.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-GUID: oI6yOwfhzv_EvT4q2Eq0uRS9PhvQuaU- X-Proofpoint-ORIG-GUID: oI6yOwfhzv_EvT4q2Eq0uRS9PhvQuaU- X-Authority-Analysis: v=2.4 cv=WasMa1hX c=1 sm=1 tr=0 ts=686298bc cx=c_pps a=PpDZqlmH/M8setHirZLBMw==:117 a=PpDZqlmH/M8setHirZLBMw==:17 a=IkcTkHD0fZMA:10 a=6IFa9wvqVegA:10 a=gAnH3GRIAAAA:8 a=o3DtMFfdRpqB0q9FUmIA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNjMwMDExNSBTYWx0ZWRfX343xRRJNTEs/ 0Oih23o3UBGWS0uRtYzpvtADJUzCQwdsWWYkYqQVoA1f5AKCprkXCabVMFA07w9cTLuZDNOuMAn wVrn0VFhGqJIb8xqnZmYC/5/W9cAHiQn4daNGfnUGekZCDrEJRfReuzKu8sDap3bQQyjKyclb5F sFbs5JaaVRyfypr5QVN13l3/02oEGwHXneEc668XkOsddwZffZYRUTT3W8K4SsPhYyH3bnYOaoZ tFOBK1vyMhiA0ZrFWcyBAq4RjhknXVELgtdfGzps8TPuHQF1JEeCii7U2YcZIytAeEtypF788NK E5gixRUw7jxICAZ1dN36kNkX907EnoQKE18pPdG6/3S6YRk5t7DiMrz7UEJPGlvNWWSawAM8QxE nxiuJdNnrZ0cJIjeGvfSwdXDsCDEWklqgtitnnldKwhEg14L7aU5BMwOySoJaP42itGjSbaF X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.7,FMLib:17.12.80.40 definitions=2025-06-30_03,2025-06-27_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 mlxscore=0 suspectscore=0 mlxlogscore=999 bulkscore=0 spamscore=0 priorityscore=1501 phishscore=0 malwarescore=0 lowpriorityscore=0 impostorscore=0 clxscore=1015 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505280000 definitions=main-2506300115 The AD4170-4 has an internal temperature sensor that can be read using the ADC. Whenever possible, configure an IIO channel to provide the chip's temperature. Reviewed-by: Nuno S=C3=A1 Signed-off-by: Marcelo Schmitt --- No changes since v3. drivers/iio/adc/ad4170-4.c | 72 ++++++++++++++++++++++++++++++++++++-- 1 file changed, 69 insertions(+), 3 deletions(-) diff --git a/drivers/iio/adc/ad4170-4.c b/drivers/iio/adc/ad4170-4.c index 9b5a0f858f48..53875b74a9a7 100644 --- a/drivers/iio/adc/ad4170-4.c +++ b/drivers/iio/adc/ad4170-4.c @@ -870,6 +870,27 @@ static const struct iio_chan_spec ad4170_channel_templ= ate =3D { }, }; =20 +static const struct iio_chan_spec ad4170_temp_channel_template =3D { + .type =3D IIO_TEMP, + .indexed =3D 0, + .channel =3D 17, + .channel2 =3D 17, + .info_mask_separate =3D BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE) | + BIT(IIO_CHAN_INFO_OFFSET) | + BIT(IIO_CHAN_INFO_CALIBSCALE) | + BIT(IIO_CHAN_INFO_CALIBBIAS) | + BIT(IIO_CHAN_INFO_SAMP_FREQ), + .info_mask_separate_available =3D BIT(IIO_CHAN_INFO_SAMP_FREQ), + .scan_type =3D { + .sign =3D 's', + .realbits =3D 24, + .storagebits =3D 32, + .shift =3D 8, + .endianness =3D IIO_BE, + }, +}; + /* * Receives the number of a multiplexed AD4170 input (ain_n), and stores t= he * voltage (in =C2=B5V) of the specified input into ain_voltage. If the in= put number @@ -1172,9 +1193,27 @@ static int ad4170_read_raw(struct iio_dev *indio_dev, return ret; case IIO_CHAN_INFO_SCALE: pga =3D FIELD_GET(AD4170_AFE_PGA_GAIN_MSK, setup->afe); - *val =3D chan_info->scale_tbl[pga][0]; - *val2 =3D chan_info->scale_tbl[pga][1]; - return IIO_VAL_INT_PLUS_NANO; + switch (chan->type) { + case IIO_VOLTAGE: + *val =3D chan_info->scale_tbl[pga][0]; + *val2 =3D chan_info->scale_tbl[pga][1]; + return IIO_VAL_INT_PLUS_NANO; + + case IIO_TEMP: + /* + * The scale_tbl converts output codes to mV units so + * multiply by MILLI to make the factor convert to =C2=B5V. + * Then, apply the temperature sensor change sensitivity + * of 477 =CE=BCV/K. Finally, multiply the result by MILLI + * again to comply with milli degrees Celsius IIO ABI. + */ + *val =3D 0; + *val2 =3D DIV_ROUND_CLOSEST(chan_info->scale_tbl[pga][1] * MILLI, 477) * + MILLI; + return IIO_VAL_INT_PLUS_NANO; + default: + return -EINVAL; + } case IIO_CHAN_INFO_OFFSET: pga =3D FIELD_GET(AD4170_AFE_PGA_GAIN_MSK, setup->afe); *val =3D chan_info->offset_tbl[pga]; @@ -1842,6 +1881,9 @@ static int ad4170_parse_channels(struct iio_dev *indi= o_dev) if (num_channels > AD4170_MAX_CHANNELS) return dev_err_probe(dev, -EINVAL, "Too many channels\n"); =20 + /* Add one for temperature */ + num_channels =3D min(num_channels + 1, AD4170_MAX_CHANNELS); + chan_num =3D 0; device_for_each_child_node_scoped(dev, child) { ret =3D ad4170_parse_channel_node(indio_dev, child, chan_num++); @@ -1849,6 +1891,30 @@ static int ad4170_parse_channels(struct iio_dev *ind= io_dev) return ret; } =20 + /* + * Add internal temperature sensor channel if the maximum number of + * channels has not been reached. + */ + if (num_channels < AD4170_MAX_CHANNELS) { + struct ad4170_setup *setup =3D &st->chan_infos[chan_num].setup; + + st->chans[chan_num] =3D ad4170_temp_channel_template; + st->chans[chan_num].address =3D chan_num; + st->chans[chan_num].scan_index =3D chan_num; + + st->chan_infos[chan_num].setup_num =3D AD4170_INVALID_SETUP; + st->chan_infos[chan_num].initialized =3D true; + + setup->afe |=3D FIELD_PREP(AD4170_AFE_REF_SELECT_MSK, + AD4170_REF_AVDD); + + ret =3D ad4170_get_input_range(st, &st->chans[chan_num], chan_num, + AD4170_REF_AVDD); + if (ret < 0) + return dev_err_probe(dev, ret, "Invalid input config\n"); + + st->chan_infos[chan_num].input_range_uv =3D ret; + } indio_dev->num_channels =3D num_channels; indio_dev->channels =3D st->chans; =20 --=20 2.47.2